CN211785764U - Voltage zero-crossing detection circuit, chip and intelligent electric meter - Google Patents
Voltage zero-crossing detection circuit, chip and intelligent electric meter Download PDFInfo
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- CN211785764U CN211785764U CN202022046183.4U CN202022046183U CN211785764U CN 211785764 U CN211785764 U CN 211785764U CN 202022046183 U CN202022046183 U CN 202022046183U CN 211785764 U CN211785764 U CN 211785764U
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Abstract
The utility model provides a voltage zero-crossing detection circuit, chip and smart electric meter, its circuit includes: the power supply control module is used for accessing an alternating current power supply and processing the accessed alternating current power supply to provide power supply voltage for the zero-crossing detection isolation module; the power supply control module includes: the power supply is supplied to a discharge filtering unit of the zero-crossing detection isolation module, and the discharge filtering unit comprises a plurality of switch diode modules for controlling the on-off state of a line between the discharge filtering unit and the zero-crossing detection isolation module; the zero-crossing detection isolation module comprises multi-phase digital isolators, the number of phases of the multi-phase digital isolators is the same as that of the switch diode modules, and the multi-phase digital isolators are connected with the power supply control module and used for outputting high and low levels according to level changes of power supply voltages accessed by the voltage input pins to realize zero-crossing detection. The utility model discloses circuit design is simple, and the low power dissipation, zero crossing detection signal are accurate, and application scope is wide.
Description
Technical Field
The utility model relates to a household electrical appliances zero cross detection technical field indicates a voltage zero cross detection circuit, chip and smart electric meter especially.
Background
In some household appliances, a control panel utilizes single chip microcomputer software to adjust power of an alternating current load so as to achieve the purposes of controlling heating and rotating speed, firstly, a zero point in alternating current, namely the moment when a zero line and a live line are equal in voltage, is detected, is delayed for a certain time with the moment as a reference, and then triggers a silicon controlled rectifier to be conducted, so that the load works in an incomplete controllable sine wave power supply environment, the power is changed, and the control purpose is achieved.
At present, the isolation detection of the zero-crossing signal of the supply voltage is realized by an optical coupler, and as shown in fig. 1, the isolation circuit is an existing isolation circuit for the zero-crossing detection of the supply voltage. The peripheral circuit of the optical coupler is complex, the power consumption is large, the cost is high, the occupied area of the PCB is large, and the signal delay at the zero-crossing time is large.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a voltage zero passage detection circuit, chip and smart electric meter realizes that circuit design is simple, low power dissipation, and zero passage detection signal is accurate, and application scope is wide.
The utility model provides a technical scheme as follows:
the utility model provides a voltage zero crossing detection circuit, include: the power supply control module and the zero-crossing detection isolation module;
the power supply control module is used for accessing an alternating current power supply and processing the accessed alternating current power supply to provide power supply voltage for the zero-crossing detection isolation module;
the power supply control module comprises: the discharge filtering unit supplies power to the zero-crossing detection isolation module and comprises a plurality of switch diode modules for controlling the on-off state of a line between the discharge filtering unit and the zero-crossing detection isolation module;
the zero-crossing detection isolation module comprises multi-phase digital isolators, the number of phases of the multi-phase digital isolators is the same as that of the switch diode modules, and the multi-phase digital isolators are connected with the power supply control module and used for outputting high and low levels according to level changes of power supply voltages accessed by the voltage input pins to realize zero-crossing detection.
Further, the power supply control module includes:
the discharging filtering unit is respectively connected with the first polarity port and the second polarity port and is used for providing the processed voltage as a power supply to the zero-crossing detection isolation module in the process that the voltage value of the accessed alternating current power supply is gradually increased from zero to the forward maximum value and in the process that the voltage value of the accessed alternating current power supply is gradually decreased from the second preset voltage value to zero;
the energy storage control unit is connected with the discharge filtering unit and used for carrying out charging energy storage until the voltage reaches a forward maximum value after the processing is started to increase from zero to a first preset voltage value;
the discharging filter unit is also used for performing discharging treatment when the accessed alternating current power supply is in a negative direction;
the energy storage control unit is further used for providing the electric energy stored in the charging process as a power supply voltage to the zero-crossing detection isolation module in the process that the processed voltage is decreased to zero from the second preset voltage value.
Further, the discharge filter unit further includes: the voltage division resistor module, the filter capacitor module and the discharge resistor module;
the anode of each switch diode module is connected with the first polarity port, and the cathode of each switch diode module is connected with the first end of the corresponding voltage division resistance module;
the second end of each voltage-dividing resistor module is respectively connected with the first end of the corresponding filter capacitor module and the first end of the corresponding discharge resistor module;
the second ends of the filter capacitor modules and the discharge resistor modules are respectively connected with the second polarity port.
Further, the discharge filter unit further includes: the voltage division resistor module, the filter capacitor module and the discharge resistor module;
the anode of each switch diode module is connected with the first polarity port, and the cathode of each switch diode module is connected with the first ends of the corresponding discharge resistor module and the voltage dividing resistor module;
the second end of each voltage-dividing resistor module is respectively connected with the first end of the corresponding filter capacitor module;
the second ends of the filter capacitor modules and the discharge resistor modules are respectively connected with the second polarity port.
Further, the energy storage control unit includes: the on-off diode module, the energy storage capacitor and the voltage stabilizing tube are connected in series;
the anode of the on-off diode module is respectively connected with the second end of the corresponding voltage division resistor module, the first end of the filter capacitor module and the first end of the discharge resistor module, and the voltage input pin of the zero-crossing detection isolation module;
the cathode of any on-off diode module is respectively connected with the first end of the energy storage capacitor and the cathode of the voltage regulator tube;
and the second end of the energy storage capacitor and the anode of the voltage regulator tube are respectively connected with the second polarity port and the first grounding pin of the zero-crossing detection isolation module.
Further, the energy storage control unit includes: the on-off diode module, the energy storage capacitor and the voltage stabilizing tube are connected in series;
the anode of the on-off diode module is respectively connected with the second end of the corresponding voltage division resistance module, the first end of the filter capacitor module and the first end of the corresponding voltage division resistance module, and the voltage input pin of the zero-crossing detection isolation module;
the cathode of any on-off diode module is respectively connected with the first end of the energy storage capacitor and the cathode of the voltage regulator tube;
and the second end of the energy storage capacitor and the anode of the voltage regulator tube are respectively connected with the second polarity port and the first grounding pin of the zero-crossing detection isolation module.
Furthermore, a first power supply pin of the multi-phase digital isolator is connected with the cathode of any on-off diode module;
a voltage input pin of the multi-phase digital isolator is connected with the anode of any on-off diode module;
a first ground pin of the multi-phase digital isolator is connected with the second polarity port;
a second power supply pin of the multi-phase digital isolator is connected with a second grounding pin of the multi-phase digital isolator through a capacitor and then grounded;
and a voltage output pin of the multi-phase digital isolator is connected with a load.
The utility model also provides a chip, the integration has as voltage zero crossing detection circuit.
The utility model also provides an intelligent ammeter, it has to integrate voltage zero crossing detection circuit.
Through the utility model provides a pair of voltage zero passage detection circuit, chip and smart electric meter can circuit design simply, low power dissipation, and zero passage detection signal is accurate, and application scope is wide.
Drawings
The above features, technical features, advantages and implementations of a voltage zero crossing detection circuit, a chip and a smart meter will be further described in the following detailed description of preferred embodiments with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of a prior art supply voltage zero crossing detection isolation circuit;
fig. 2 is a schematic structural diagram of an embodiment of a voltage zero crossing detection circuit of the present invention;
fig. 3 is a schematic structural diagram of another embodiment of a voltage zero-crossing detection circuit according to the present invention;
fig. 4 is a schematic diagram of the voltage zero crossing detection waveform of the present invention;
fig. 5 is a schematic structural diagram of another embodiment of a voltage zero crossing detection circuit according to the present invention;
fig. 6 is a schematic structural diagram of another embodiment of the voltage zero-crossing detection circuit of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. However, it will be apparent to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
For the sake of simplicity, only the parts relevant to the present invention are schematically shown in the drawings, and they do not represent the actual structure as a product. In addition, in order to make the drawings concise and understandable, components having the same structure or function in some of the drawings are only schematically illustrated or only labeled. In this document, "one" means not only "only one" but also a case of "more than one".
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
In addition, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not intended to indicate or imply relative importance.
In order to more clearly illustrate embodiments of the present invention or technical solutions in the prior art, specific embodiments of the present invention will be described below with reference to the accompanying drawings. It is obvious that the drawings in the following description are only examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be obtained from these drawings without inventive effort.
An embodiment of the utility model, as shown in fig. 2, a voltage zero crossing detection circuit, include: a power supply control module 100 and a zero-crossing detection isolation module 200;
a power supply control module 100, configured to access an ac power supply, and process the accessed ac power supply to provide a power supply voltage to the zero-crossing detection isolation module 200;
the power supply control module 100 includes: supplying power to a discharge filtering unit of the zero-crossing detection isolation module 200, wherein the discharge filtering unit comprises a plurality of switch diode modules for controlling the on-off state of a line between the discharge filtering unit and the zero-crossing detection isolation module;
the zero-crossing detection isolation module 200 includes multi-phase digital isolators, the number of phases of the multi-phase digital isolators is the same as the number of the switching diode modules, and the multi-phase digital isolators are connected to the power supply control module 100 and configured to output high and low levels according to level changes of the power supply voltage connected to the voltage input pins to implement zero-crossing detection.
Specifically, the ac power source connected to the power supply control module 100 in this embodiment may be a commercial power, or a low-and-medium-frequency ac power source. When the voltage magnitude and the voltage direction of the ac power supply periodically change with time, the power supply control module 100 processes the accessed ac power supply, so that the power supply control module 100 provides the power supply voltage to the zero-crossing detection isolation module 200. Since the ac power source has a characteristic of periodic variation, the level of the power supply voltage provided by the power supply control module 100 to the zero-crossing detection isolation module 200 also varies, so that the zero-crossing detection can be realized according to the high-low level switching variation of the power supply voltage. Through the power supply control module 100 and the zero-crossing detection isolation module 200 of the embodiment, zero-crossing detection is performed, the original voltage zero-crossing detection isolation circuit is simplified, the area of the PCB is reduced, the circuit design is simple, the power consumption is low, the zero-crossing detection signal is accurate, the time delay is small, the distortion is small, and the application range is wide.
Based on the foregoing embodiments, the power supply control module 100 includes:
the discharging filtering unit is respectively connected with the first polarity port and the second polarity port, and is used for providing the processed voltage as a power supply to the zero-crossing detection isolation module 200 in the process that the voltage value of the accessed alternating current power supply is gradually increased from zero to the positive maximum value and in the process that the voltage value of the accessed alternating current power supply is gradually decreased from the second preset voltage value to zero;
the discharging filter unit is also used for performing discharging treatment when the accessed alternating current power supply is in a negative direction;
the energy storage control unit is connected with the discharge filtering unit and used for carrying out charging energy storage until the voltage reaches a forward maximum value after the processing is started to increase from zero to a first preset voltage value;
and the energy storage control unit is further configured to, in the process that the processed voltage is decreased to zero from the second preset voltage value, provide the electric energy stored in the charging process as a power supply voltage to the zero-crossing detection isolation module 200.
Specifically, the first polarity port may be a positive pole (or a live line) of the medium-low frequency ac power supply, and may also be a negative pole (or a neutral line) of the medium-low frequency ac power supply.
Based on the foregoing embodiment, the discharge filter unit includes: the switch diode module, the voltage-dividing resistor module, the filter capacitor module and the discharge resistor module;
the anode of each switch diode module is connected with the first polarity port, and the cathode of each switch diode module is connected with the first end of the corresponding voltage division resistance module;
the second end of each voltage-dividing resistor module is respectively connected with the first end of the corresponding filter capacitor module and the first end of the corresponding discharge resistor module;
the second ends of the filter capacitor modules and the discharge resistor modules are respectively connected with the second polarity port.
The energy storage control unit includes: the on-off diode module, the energy storage capacitor and the voltage stabilizing tube are connected in series;
the anode of the on-off diode module is respectively connected with the second end of the corresponding voltage division resistor module, the first end of the filter capacitor module and the first end of the discharge resistor module, and the voltage input pin of the zero-crossing detection isolation module 200;
the cathode of any on-off diode module is respectively connected with the first end of the energy storage capacitor and the cathode of the voltage regulator tube;
the second end of the energy storage capacitor and the anode of the voltage regulator tube are respectively connected with the second polarity port and the first grounding pin of the zero-crossing detection isolation module 200.
Specifically, the discharge filter unit may include at least one switching diode module, a voltage dividing resistor module, a filter capacitor module, and a discharge resistor module. The energy storage control unit may include: the switch diode module, the voltage-dividing resistor module, the filter capacitor module, the discharge resistor module and the on-off diode module are the same in number.
Wherein, a switch diode module includes a diode, and an on-off diode module includes a diode. A voltage-dividing resistor module may include at least one resistor, wherein the resistors are connected in series if two or more resistors are included. A filter capacitor module may comprise at least one capacitor, wherein the capacitors are connected in parallel if two or more capacitors are included. A discharge resistor module may include at least one resistor, wherein the resistors are connected in series if two or more resistors are included.
The zero crossing detection isolation module 200 includes: the phase quantity of the multi-phase digital isolators is the same as that of the switch diode modules;
a first power supply pin VDD1 of the multi-phase digital isolator is connected with the cathode of any on-off diode module;
a voltage input pin VIN of the multi-phase digital isolator is connected with the anode of any on-off diode module;
a first grounding pin GND1 of the multi-phase digital isolator is connected with a second polarity port;
the second power supply pin VDD2 of the multi-phase digital isolator is connected with the second grounding pin GND2 of the multi-phase digital isolator through a capacitor and then grounded;
and a voltage output pin VOUT of the multi-phase digital isolator is connected with a load.
Specifically, the multi-phase digital isolator may be a single-phase digital isolator, a two-phase digital isolator, a three-phase digital isolator, or other phase digital isolators.
Illustratively, as shown in FIG. 3, a switching diode moduleThe number of the voltage division resistor module, the filter capacitor module, the discharge resistor module and the on-off diode module is one. The switch diode module comprises a first diode D301, the voltage dividing resistor module comprises a first resistor R301 and a second resistor R302, the filter capacitor module comprises a first capacitor C301, the discharge resistor module comprises a third resistor R303, and the on-off diode module comprises a second diode D302. The anode of the first diode D301 is connected with a live wire, and the cathode of the first diode D301 is connected with the first resistor R301 and the second resistor R302 in series and then connected with the first capacitor C301, the third resistor R303, the energy storage capacitor C302 and the first voltage-stabilizing tube Z301 in parallel in sequence and then connected with a zero wire. Referring to fig. 3, a voltage zero crossing detection waveform diagram of the output voltage varying with the alternating voltage after the zero crossing detection circuit performs the zero crossing detection is shown in fig. 4, where the left side of fig. 4 is the overall waveform variation diagram, and the right side of fig. 4 is t0And the local amplification change of the alternating current power supply LINE at the live wire from the negative zero crossing to the positive is indicative at the beginning of the moment. The working principle of the circuit is as follows: as indicated by t in FIG. 40At this time, when the alternating current power LINE on the live wire is changed from negative zero to positive zero, the first diode D301 is turned on, the voltage of the alternating current power LINE is divided by the first resistor R301, the second resistor R302 and the third resistor R303, and the voltage V _ R303 of the third resistor R303 is input to the voltage input pin VIN of the single-phase digital isolator U301 as a signal voltage. The capacitance value of the first capacitor C301 is small, and mainly filters burrs and noise on signals.
At t in FIG. 40~t1During this time, the voltage V _ R303 of the third resistor R303 is less than the threshold of the input high level, and the voltage output pin VOUT of the single-phase digital isolator U301 maintains to output the low level (L); when the alternating current power supply LINE at the live wire changes from negative zero crossing to positive backward and continues to increase, the voltage V _ R303 of the third resistor R303 also increases, and at t1At the moment, the voltage of the voltage V _ R303 rises to the threshold of the chip input high level, the voltage output pin VOUT of the single-phase digital isolator U301 changes from the output low level (L) to the output high level (H), and since the voltage V _ R303 on the third resistor R303 rises with the rise of the voltage of the alternating current power LINE, the voltage V _ R303 rises to t of fig. 42Constantly, after voltage V _ R303 on third resistance R303 reaches (VDD 1+ 0.7) V (according to the utility model discloses a first predetermined voltage value, ohm law formula carry out the numerical value that partial pressure calculation obtained promptly), second diode D302 switches on, and alternating current power supply LINE passes through first diode D301, first resistance R301, second resistance R302, second diode D302 to single-phase digital isolator U301's first power pin VDD1 is in order to supply power for single-phase digital isolator U301, in addition, begins to charge for energy storage capacitor C302. To t of FIG. 43At the moment, when the voltage on the energy storage capacitor C302 is higher than the breakdown voltage of the first voltage regulator tube Z301, the first voltage regulator tube Z301 acts to limit the highest voltage on the energy storage capacitor C302, and protect the first power supply pin VDD1 of the single-phase digital isolator U301 from overvoltage breakdown.
When the voltage of the ac power LINE decreases from the positive maximum value to a certain value (i.e. according to the present invention, the second preset voltage value and the ohm's law formula are calculated to obtain the value of the divided voltage), t in fig. 44At the moment, the second diode D302 is disconnected, and the energy storage capacitor C302 starts to continuously provide the power supply voltage for the single-phase digital isolator U301 until the second diode D302 is turned on again in the next period, as the voltage of the ac power LINE is further reduced, the voltage V _ R303 on the third resistor R303 is further reduced, and when the voltage of the ac power LINE is further reduced to be near zero, t in fig. 45At this time, the voltage V _ R303 on the third resistor R303 drops to the threshold of the chip input low level, and the voltage output pin VOUT of the single-phase digital isolator U301 changes from the output high level (H) to the output low level (L).
When the voltage of the alternating current power supply LINE changes from positive zero crossing to negative, a discharging loop is formed by the third resistor R303 and the first capacitor C301 to discharge, so that the voltage connected to the voltage input pin VIN of the single-phase digital isolator U301 is pulled down, when the subsequent discharging is finished, the process of outputting a high level (H) is repeated after the voltage of the alternating current power supply LINE changes from negative zero crossing to positive, and the level inversion is repeated. Illustratively, as shown in fig. 5, the number of the switching diode module, the voltage dividing resistor module, the filter capacitor module, the discharge resistor module and the on-off diode module is three. The three switch diode modules, the voltage dividing resistor module, the filter capacitor module, the discharge resistor module and the on-off diode module are respectively connected with three voltage input ends (respectively VIA, VIB and VIC) of the three-phase digital isolator U501 according to the mode shown in fig. 5. The voltage zero-crossing detection circuit shown in fig. 5 is similar to the voltage zero-crossing detection circuit shown in fig. 3 in the working principle of zero-crossing detection, and is not described in detail here.
In the embodiment, the digital isolator is adopted to realize the isolation detection of the alternating voltage at the zero crossing moment, and the circuit is simple, the power consumption is low and the cost is low. The circuit has the advantages of simplifying the original voltage zero-crossing detection isolation circuit, reducing the area of a PCB (printed circuit board), being simple in circuit design, low in power consumption, accurate in zero-crossing detection signal, small in time delay, small in distortion and wide in application range, and being suitable for all scenes of medium-low frequency alternating voltage frequency detection and voltage zero-crossing detection or scenes of commercial power frequency detection and voltage zero-crossing detection.
Based on the foregoing embodiment, the discharge filter unit includes: the switch diode module, the voltage-dividing resistor module, the filter capacitor module and the discharge resistor module;
the anode of each switch diode module is connected with the first polarity port, and the cathode of each switch diode module is connected with the first ends of the corresponding discharge resistor module and the voltage dividing resistor module;
the second end of each voltage-dividing resistor module is respectively connected with the first end of the corresponding filter capacitor module;
the second ends of the filter capacitor modules and the discharge resistor modules are respectively connected with the second polarity port.
The energy storage control unit includes: the on-off diode module, the energy storage capacitor and the voltage stabilizing tube are connected in series;
the anode of the on-off diode module is respectively connected with the second end of the corresponding voltage division resistance module, the first end of the filter capacitor module and the first end of the corresponding voltage division resistance module, and the voltage input pin of the zero-crossing detection isolation module 200;
the cathode of any on-off diode module is respectively connected with the first end of the energy storage capacitor and the cathode of the voltage regulator tube;
the second end of the energy storage capacitor and the anode of the voltage regulator tube are respectively connected with the second polarity port and the first grounding pin of the zero-crossing detection isolation module 200.
Specifically, the discharge filter unit may include at least one switching diode module, a voltage dividing resistor module, a filter capacitor module, and a discharge resistor module. The energy storage control unit may include: the switch diode module, the voltage-dividing resistor module, the filter capacitor module, the discharge resistor module and the on-off diode module are the same in number.
Wherein, a switch diode module includes a diode, and an on-off diode module includes a diode. A voltage-dividing resistor module may include at least one resistor, wherein the resistors are connected in series if two or more resistors are included. A filter capacitor module may comprise at least one capacitor, wherein the capacitors are connected in parallel if two or more capacitors are included. A discharge resistor module may include at least one resistor, wherein the resistors are connected in series if two or more resistors are included.
The zero crossing detection isolation module 200 includes: the phase quantity of the multi-phase digital isolators is the same as that of the switch diode modules;
a first power supply pin of the multi-phase digital isolator is connected with the cathode of any on-off diode module;
a voltage input pin of the multi-phase digital isolator is connected with the anode of any on-off diode module;
a first grounding pin of the multi-phase digital isolator is connected with the second polarity port;
a second power supply pin of the multi-phase digital isolator is connected with a second grounding pin of the multi-phase digital isolator through a capacitor and then grounded;
and a voltage output pin of the multi-phase digital isolator is connected with a load.
Specifically, the multi-phase digital isolator may be a single-phase digital isolator, a two-phase digital isolator, a three-phase digital isolator, or other phase digital isolators.
Illustratively, as shown in fig. 6, the number of the switching diode module, the voltage dividing resistor module, the filter capacitor module, the discharge resistor module and the on-off diode module is one. The switch diode module comprises a third diode D601, the voltage dividing resistor module comprises a fourth resistor R601 and a fifth resistor R602, the filter capacitor module comprises a third capacitor C601, the discharge resistor module comprises a sixth resistor R603 and a seventh resistor R604, and the on-off diode module comprises a fourth diode D602. The anode of the third diode D601 is connected with the live wire, and the cathode of the third diode D601 is connected with the fourth resistor R601 and the fifth resistor R602 in series, and then is connected with the third capacitor C601, the second energy storage capacitor C602 and the second voltage regulator tube Z601 in parallel in sequence. In addition, a first end of the sixth resistor R603 is connected to a cathode of the third diode D601 and a first end of the fourth resistor R601, respectively, a second end of the sixth resistor R603 is connected to a Neutral (Neutral) line after being connected to the seventh resistor R604 in series, and a second end of the fourth resistor R601 is connected to the fifth resistor R602. The voltage zero-crossing detection circuit shown in fig. 5 is similar to the voltage zero-crossing detection circuit shown in fig. 3 in the working principle of zero-crossing detection, and is not repeated here, except that fig. 3 shows that the third resistor R303 and the first capacitor C301 form a discharging loop for discharging, and fig. 6 shows that the fourth resistor R601, the fifth resistor R602, the sixth resistor R603 and the third capacitor C601 form a discharging loop for discharging.
Preferably, a single-phase (also referred to as a single-channel) digital isolator may be used in any of the set of tidal volumes U, M, E, such as a model π 110M31 single-phase digital isolator in the M-set, for example, from ADI: ADuM1100, TI: ISO7710, Silicon Labs: si8610EC, etc.
Three-phase (also referred to as three-channel) digital isolators may be used in any of the series of magnitude surges U, M, E, such as the model pi 130M31 in the M series, also available from ADI corporation: ADuM130, TI: ISO7730, SiliconLabs: si8630EC, nano-core micro: NSI8130 and the like.
In the embodiment, the digital isolator is adopted to realize the isolation detection of the alternating voltage at the zero crossing moment, and the circuit is simple, the power consumption is low and the cost is low. The circuit has the advantages of simplifying the original voltage zero-crossing detection isolation circuit, reducing the area of a PCB (printed circuit board), being simple in circuit design, low in power consumption, accurate in zero-crossing detection signal, small in time delay, small in distortion and wide in application range, and being suitable for all scenes of medium-low frequency alternating voltage frequency detection and voltage zero-crossing detection or scenes of commercial power frequency detection and voltage zero-crossing detection.
The utility model discloses an embodiment, a chip, integrated have as voltage zero crossing detection circuit, voltage zero crossing detection circuit includes: a power supply control module 100 and a zero-crossing detection isolation module 200;
the power supply control module 100 is used for accessing an alternating current power supply LINE and processing the accessed alternating current power supply LINE to provide power supply voltage for the zero-crossing detection isolation module 200;
the power supply control module 100 includes: supplying power to a discharge filtering unit of the zero-crossing detection isolation module 200, wherein the discharge filtering unit comprises a plurality of switch diode modules for controlling the on-off state of a line between the discharge filtering unit and the zero-crossing detection isolation module;
the zero-crossing detection isolation module 200 includes multi-phase digital isolators, the number of phases of the multi-phase digital isolators is the same as the number of the switching diode modules, and the multi-phase digital isolators are connected to the power supply control module 100 and configured to output high and low levels according to level changes of the power supply voltage connected to the voltage input pins to implement zero-crossing detection.
The utility model discloses an embodiment, a smart electric meter, it has to integrate voltage zero crossing detection circuit, voltage zero crossing detection circuit includes: a power supply control module 100 and a zero-crossing detection isolation module 200;
the power supply control module 100 is used for accessing an alternating current power supply LINE and processing the accessed alternating current power supply LINE to provide power supply voltage for the zero-crossing detection isolation module 200;
the power supply control module 100 includes: supplying power to a discharge filtering unit of the zero-crossing detection isolation module 200, wherein the discharge filtering unit comprises a plurality of switch diode modules for controlling the on-off state of a line between the discharge filtering unit and the zero-crossing detection isolation module;
the zero-crossing detection isolation module 200 includes multi-phase digital isolators, the number of phases of the multi-phase digital isolators is the same as the number of the switching diode modules, and the multi-phase digital isolators are connected to the power supply control module 100 and configured to output high and low levels according to level changes of the power supply voltage connected to the voltage input pins to implement zero-crossing detection.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or recited in detail in a certain embodiment.
It should be noted that the above embodiments can be freely combined as necessary. The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. A voltage zero crossing detection circuit, comprising: the power supply control module and the zero-crossing detection isolation module;
the power supply control module is used for accessing an alternating current power supply and processing the accessed alternating current power supply to provide power supply voltage for the zero-crossing detection isolation module;
the power supply control module comprises: the discharge filtering unit supplies power to the zero-crossing detection isolation module and comprises a plurality of switch diode modules for controlling the on-off state of a line between the discharge filtering unit and the zero-crossing detection isolation module;
the zero-crossing detection isolation module comprises multi-phase digital isolators, the number of phases of the multi-phase digital isolators is the same as that of the switch diode modules, and the multi-phase digital isolators are connected with the power supply control module and used for outputting high and low levels according to level changes of power supply voltages accessed by the voltage input pins to realize zero-crossing detection.
2. A voltage zero crossing detection circuit as claimed in claim 1, wherein the power control module comprises:
the discharging filtering unit is respectively connected with the first polarity port and the second polarity port and is used for providing the processed voltage as a power supply to the zero-crossing detection isolation module in the process that the voltage value of the accessed alternating current power supply is gradually increased from zero to the forward maximum value and in the process that the voltage value of the accessed alternating current power supply is gradually decreased from the second preset voltage value to zero;
the energy storage control unit is connected with the discharge filtering unit and used for carrying out charging energy storage until the voltage reaches a forward maximum value after the processing is started to increase from zero to a first preset voltage value;
the discharging filter unit is also used for performing discharging treatment when the accessed alternating current power supply is in a negative direction;
the energy storage control unit is further used for providing the electric energy stored in the charging process as a power supply voltage to the zero-crossing detection isolation module in the process that the processed voltage is decreased to zero from the second preset voltage value.
3. A voltage zero-crossing detection circuit as claimed in claim 2, wherein the discharging filter unit further comprises: the voltage division resistor module, the filter capacitor module and the discharge resistor module;
the anode of each switch diode module is connected with the first polarity port, and the cathode of each switch diode module is connected with the first end of the corresponding voltage division resistance module;
the second end of each voltage-dividing resistor module is respectively connected with the first end of the corresponding filter capacitor module and the first end of the corresponding discharge resistor module;
the second ends of the filter capacitor modules and the discharge resistor modules are respectively connected with the second polarity port.
4. A voltage zero-crossing detection circuit as claimed in claim 2, wherein the discharging filter unit further comprises: the voltage division resistor module, the filter capacitor module and the discharge resistor module;
the anode of each switch diode module is connected with the first polarity port, and the cathode of each switch diode module is connected with the first ends of the corresponding discharge resistor module and the voltage dividing resistor module;
the second end of each voltage-dividing resistor module is respectively connected with the first end of the corresponding filter capacitor module;
the second ends of the filter capacitor modules and the discharge resistor modules are respectively connected with the second polarity port.
5. A voltage zero crossing detection circuit as claimed in claim 3, wherein the energy storage control unit comprises: the on-off diode module, the energy storage capacitor and the voltage stabilizing tube are connected in series;
the anode of the on-off diode module is respectively connected with the second end of the corresponding voltage division resistor module, the first end of the filter capacitor module and the first end of the discharge resistor module, and the voltage input pin of the zero-crossing detection isolation module;
the cathode of any on-off diode module is respectively connected with the first end of the energy storage capacitor and the cathode of the voltage regulator tube;
and the second end of the energy storage capacitor and the anode of the voltage regulator tube are respectively connected with the second polarity port and the first grounding pin of the zero-crossing detection isolation module.
6. A voltage zero crossing detection circuit as claimed in claim 4, wherein the energy storage control unit comprises: the on-off diode module, the energy storage capacitor and the voltage stabilizing tube are connected in series;
the anode of the on-off diode module is respectively connected with the second end of the corresponding voltage division resistance module, the first end of the filter capacitor module and the first end of the corresponding voltage division resistance module, and the voltage input pin of the zero-crossing detection isolation module;
the cathode of any on-off diode module is respectively connected with the first end of the energy storage capacitor and the cathode of the voltage regulator tube;
and the second end of the energy storage capacitor and the anode of the voltage regulator tube are respectively connected with the second polarity port and the first grounding pin of the zero-crossing detection isolation module.
7. A voltage zero crossing detection circuit as claimed in claim 5 or 6, wherein:
a first power supply pin of the multi-phase digital isolator is connected with the cathode of any on-off diode module;
a voltage input pin of the multi-phase digital isolator is connected with the anode of any on-off diode module;
a first ground pin of the multi-phase digital isolator is connected with the second polarity port;
a second power supply pin of the multi-phase digital isolator is connected with a second grounding pin of the multi-phase digital isolator through a capacitor and then grounded;
and a voltage output pin of the multi-phase digital isolator is connected with a load.
8. A chip incorporating a voltage zero crossing detection circuit as claimed in any one of claims 1 to 7.
9. A smart meter incorporating a voltage zero crossing detection circuit as claimed in any one of claims 1 to 7.
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| CN202022046183.4U CN211785764U (en) | 2020-09-18 | 2020-09-18 | Voltage zero-crossing detection circuit, chip and intelligent electric meter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113037321A (en) * | 2021-03-11 | 2021-06-25 | 华立科技股份有限公司 | Communication module |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113037321A (en) * | 2021-03-11 | 2021-06-25 | 华立科技股份有限公司 | Communication module |
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